Part Of Leto's II Grand Design?
Personally, I felt this novel was too long and too slow paced for my liking. However, it deals mainly with the Bene Gesserit, which I like a lot. They raise another Duncan ghola from a small boy, while keeping a watchful eye on Sheeana on Rakis. The Bene Gesserit are threatened by the return of the Honored Matres from the Scattering, and the secret the Tleilaxu have put in the new Duncan ghola. I did like the character Miles Teg, and his amazing Mentat abilities. His involvement help to keep some of the story interesting and to move along. I don't mean this as a bad thing, but the best was the last few chapters of the book were things really start to unfold. ( I would recommend this book as a first time read of the Dune series.)